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Shareholders' equity
 3 Months Ended
Mar. 31, 2019
Equity [Abstract]  
Shareholders' equity
Shareholders’ equity
Basic earnings per share is computed by dividing net income by the weighted average number of common shares outstanding during the period. Diluted earnings per share is computed in the same manner except that the weighted average number of shares is increased to include dilutive securities. The following table provides a reconciliation of basic to diluted weighted average number of common shares outstanding:
 
Three Months Ended
 
March 31, 2019
 
April 1, 2018
 
(Shares in thousands)
Basic
46,050

 
45,329

Dilutive effect of share-based awards
892

 
1,044

Dilutive effect of convertible warrants
—

 
322

Diluted
46,942

 
46,695


The weighted average number of shares that were antidilutive and therefore excluded from the calculation of earnings per share were 0.1 million and 0.6 million for the three months ended March 31, 2019 and April 1, 2018, respectively.
The following tables provide information relating to the changes in accumulated other comprehensive loss, net of tax, for the three months ended March 31, 2019 and April 1, 2018:
 
Cash Flow Hedges
 
Pension and Other Postretirement Benefit Plans
 
Foreign Currency Translation Adjustment
 
Accumulated Other Comprehensive (Loss) Income
 
(Dollars in thousands)
Balance as of December 31, 2018
$
807

 
$
(131,380
)
 
$
(210,512
)
 
$
(341,085
)
Other comprehensive income (loss) before reclassifications
(434
)
 
(122
)
 
(236
)
 
(792
)
Amounts reclassified from accumulated other comprehensive income
(163
)
 
1,351

 
—

 
1,188

Net current-period other comprehensive income (loss)
(597
)
 
1,229

 
(236
)
 
396

Balance as of March 31, 2019
$
210

 
$
(130,151
)
 
$
(210,748
)
 
$
(340,689
)
 
Cash Flow Hedges
 
Pension and Other Postretirement Benefit Plans
 
Foreign Currency Translation Adjustment
 
Accumulated Other Comprehensive (Loss) Income
 
(Dollars in thousands)
Balance as of December 31, 2017
$
340

 
$
(138,808
)
 
$
(126,623
)
 
$
(265,091
)
Other comprehensive (loss) before reclassifications
1,341

 
(478
)
 
81,188

 
82,051

Amounts reclassified from accumulated other comprehensive loss
(720
)
 
1,359

 
—

 
639

Net current-period other comprehensive income
621

 
881

 
81,188

 
82,690

Balance as of April 1, 2018
$
961

 
$
(137,927
)
 
$
(45,435
)
 
$
(182,401
)

  
The following table provides information relating to the location in the statements of operations and amount of reclassifications of losses/(gains) in accumulated other comprehensive (loss) income into expense/(income), net of tax, for the three months ended March 31, 2019 and April 1, 2018:
 
Three Months Ended
 
March 31, 2019
 
April 1, 2018
 
(Dollars in thousands)
(Gains) losses on foreign exchange contracts:
 
 
 
Cost of goods sold
$
(186
)
 
$
(833
)
Total before tax
(186
)
 
(833
)
Taxes (benefit)
23

 
113

Net of tax
$
(163
)
 
$
(720
)
Losses (gains) on cross-currency swaps (net investment hedge):
 
 
 
Interest expense
$
(3,882
)
 
$
—

Total before tax
(3,882
)
 
—

Tax expense
929

 
—

Net of tax
$
(2,953
)
 
$
—

Amortization of pension and other postretirement benefit items (1):
Actuarial losses
$
1,740

 
$
1,746

Prior-service costs
22

 
24

Total before tax
1,762

 
1,770

Tax benefit
(411
)
 
(411
)
Net of tax
$
1,351

 
$
1,359

Total reclassifications, net of tax
$
(1,765
)
 
$
639

(1) These accumulated other comprehensive (loss) income components are included in the computation of net benefit expense for pension and other postretirement benefit plans.